#include<stdio.h>

int main(void)
{
	int n,score,failed=0;
	scanf("%d",&n);
	
	for(int i=0;i<n;i++)
	{
		if(scanf("%d",&score),score<60)
		failed++;
	}
	
	printf("%d",(int)100.0*failed/n);
	putchar('%');
	
	return 0;
}
